Abstract
Depleted reservoirs are widely used for underground gas storage due to their advantages of low construction cost and easy development. Under the influence of complex geological conditions and frequent operations, the integrity of the wells in depleted reservoirs is prone to failure, which would potentially lead to gas leakage. In this study, by using a finite element–based computational fluid dynamics model, we have developed evaluation criteria for assessing the severity of the occurred wellbore integrity failure and the risk of the un-occurred wellbore integrity failures respectively to identify hazardous zones potentially prone to wellbore integrity failure. The study results indicate that the gas storage wellbore integrity failure is prone to occur inside the wellbore structure in the direction of the minimum ground stress near the lower boundary of the formation interlayer. The wellbore integrity failure hazardous zones are mainly concentrated at the formation interlayer boundaries. The practical guidelines and solutions derived from current research results can provide an accurate direction for monitoring and protecting work of wellbore integrity and avoid environment pollution problems caused by natural gas leakage.
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The data used to support the findings of this study are available from the corresponding author upon request.
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Acknowledgements
The authors would like to thank anonymous reviewers for their constructive discussions and inspiring comments. The authors would like to thank the financial support for this work from the National Natural Science Foundation of China (Grant No. 52304017).
Funding
The authors received financial support for this work from the National Natural Science Foundation of China (Grant No. 52304017).
National Natural Science Foundation of China,Grant No. 52304017,Chaojie Zhao
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Rui Wang: conceptualization, methodology, software, writing—original draft.
Ergun Kuru: conceptualization, writing—review and editing, supervision, resources.
Chaojie Zhao: validation, supervision, visualization.
Minggang Liu: writing—review and editing, investigation.
Yanxin Jin: supervision.
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Wang, R., Kuru, E., Zhao, C. et al. Assessment of wellbore integrity failure risk and hazardous zones in depleted reservoirs underground gas storage during the operation processes. Environ Sci Pollut Res 31, 2079–2089 (2024). https://doi.org/10.1007/s11356-023-31297-8
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DOI: https://doi.org/10.1007/s11356-023-31297-8